Scrub brush



FIG. 1 is a rear perspective view of a scrub brush in accordance with the present disclosure;

FIG. 2 is a front view of a scrub brush in accordance with the present disclosure;

FIG. 3 is a rear view of a scrub brush in accordance with the present disclosure; FIG. 4 is a side view of a scrub brush in accordance with the present disclosure;

FIG. 5 is a top view of a scrub brush in accordance with the present disclosure; and,

FIG. 6 is a bottom view of a scrub brush in accordance with the present disclosure.

The broken lines represent environmental structure that forms no part of the claimed design. 

CLAIM The ornamental design for a scrub brush, as shown and described. 